Re: Concatenate matrices

• To: mathgroup at smc.vnet.net
• Subject: [mg51424] Re: Concatenate matrices
• From: "Curt Fischer" <crf3 at po.cwru.edu>
• Date: Sun, 17 Oct 2004 03:05:08 -0400 (EDT)
• References: <ckqmb1\$nb0\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Thomas Guignard wrote:
> Hi all
>
> Does someone know if there is a function in Mathematica to simply
> concatenate matrices (provided their dimensions are right).
>
> Example:
>
>      / e11  e12  e13 \
> E = | e21  e22  e23 |
>      \ e31  e32  e33 /
>
>      / f11  f12 \
> F = | f21  f22 |
>      \ f31  f32 /
>
> I'd like to have:
>
>      / e11  e12  e13  f11  f12 \
> R = | e21  e22  e23  f21  f22 |
>      \ e31  e32  e33  f31  f32 /

I don't know of a simple built-in function to do this, but it is easy to

In[1]:=
a={{a11,a12,a13},{a21,a22,a23}};

In[2]:=
b={{b11,b12},{b21,b22}};

In[3]:=

In[4]:=
concatenateMat[a,b]

Out[4]=
{{a11,a12,a13,b11,b12},{a21,a22,a23,b21,b22}}

--
Curt Fischer

```

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